Finding the Fourth Proportional to 2,887.61, 3,984.59 and 2,131.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,887.61 : 3,984.59 = 2,131.79 : x
2. Step 2: Convert to fraction form
   2,887.61/3,984.59 = 2,131.79/x
3. Step 3: Cross multiply
   2,887.61x = 3,984.59 × 2,131.79
4. Step 4: Simplify right side
   2,887.61x = 8,494,294.52
5. Step 5: Solve for x
   x = 8,494,294.52/2,887.61
6. Step 6: Final answer
   x = 2,941.64